larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte
同义词：macrospore
megaspore详细解释
meg.a.spore n.（名词）The larger of two types of spores that give rise to a female gametophyte.Also called macrospore 大孢子：两种孢子中较大的一种，会产生雌性配子体也作 macrospore 【引伸】 meg.aspor.ic adj.（形容词）
